Dallas Area Rapid Transit (DART) is a transit agency in Downtown Dallas, Texas. It operates buses, light rail, commuter rail, and high-occupancy vehicle lanes in Dallas and twelve of its suburbs. DART was created in 1983 to replace a municipal bus system and funded expansion of the region's transit network through a sales tax levied in member cities. DART's light rail systemis the longest in the United States, at over 93 miles (149.7 km), and began operation in 1996. DART operates the Trinity Railway Express between Dallas and Fort Worth, through an interlocal agreement with Trinity Metro. The agency also operates the Dallas Streetcar and provides funding for the non-profit McKinney Avenue Streetcar.